Rock-drilling engine



Dec, 111 11923.

c. A. HULTQUIST ROCK DRILLING (ENGINE 2 Sheets-Sheet 1 Filed A112. 26, 1919 fizz.

INVENTOR. {flZZZZi BY WW A TTORNEYS @ec. n, 1923.. 1,477,353

' C. A. HUL IST Patented Dec. 11, 1923.

' unites stares innate Parana optics.

CHARLES A. HULTQUIST, or LOS enemas, onnrronnrn.

ROCK-DRILLING ENGINE.

Application filed August 26, 1919. Serial No. 319,994.

Rock-Drilling Engines, of which the fol lowing is a specification.

My invention relates to rock drilling engines and consists of the novel features herein shown, described and claimed.

Specifically my object is to make a rock drill having means whereby the entire compressed air force may be temporarily directed to cleaning out the working parts of the drill.

Figure 1 is a perspective view of a rock drilling engine embodying the principles of my invention.

Fig. 2 is an enlarged vertical central sectional detail on the line 2-2 of Fig. 1 and looking in the direction indicated by the arrow.

Fig. 3 is an enlarged horizontal section on the line 3.-3 of Fig.2.

Fig. 4 is a vertical cross sectional detail on the line 4-4 of Fig. 3 with the plunger omitted.

Fig. 5 is an enlarged cross section on the line 5--5 of Fig. 2.

The valve barrel 1 is formed integral with the head 2, and the compressed air pipe 3 it attached to the head The valve barrel 1 has a vertical bore 4 and a port 5 leads from the inner end of the air pipe 3 to the central part oif'the bore 4.

The air cylinder 6 is connected to the head 2 and has an air chamber 7. The plunger 8 extends from the chamber 7 through the plunger casing or hearing 9. The plunger casing 9 has an annular groove 10 formed from its upper outer face 11 and ports 12 leading downwardly from the groove 10 to the lower end of the casing, there being a flange 13 extending downwardly from the casing around the lower ends of the ports 12. A flange 14 extends upwardly from the inner part of the casing 9 above and inside of the groove 10 and flts within the lower end of the cylinder 6.

A port 15 leads from the bore 4 some dis tance below the port 5, and the port 15 exv tends a short distance into the body of the cylinder 6 and downwardly to the groove 10. A valve 16 is formed integral with a valve stem 17 and the valve is inserted upwardly into the bore 4. The upper end of the bore 4 is reduced to form a shoulder 18 and to fit the upper endof the stem 1'7, and the valve 16 fits against the shoulder 18. 6 A segond valve 19 is formed integral with the lower end of the stem 17 some distance below the valve 1.6 so as to make an air chamber 20 between the valves 16 and 19, and the valve 19 is in position to close the port 15 when the valve 16 is against the shoulder 18.

A spring 21 is placed against the lower end of the valve 19 and a plug 22 is screwed into the lower end of the bore 4 and has a 7 spring seat 23 in its upper face to receive the spring 21. A button handle 24 is screwed upon the upper end of the valve stem 17.

The spring 21 serves to hold the valves 16 and 19 elevated so that the valve 19 will close the port 15, and when it is desired to clean out the drill the handle 24 is pressed downwardly to allow the compressed air to pass from the port 5 through the chamber 20 to the port 15, and when the cleaning operation is completed the handle 24 may be released or manually raised to cut off the air. The spring 21 may be omitted if the valves 16 and 19 or the stem 17 are made sufficiently tight to maintain their positions after having been manually adjusted.

The plunger casing 9 fits with the flange 13 against the upper end of the lining 25 so that the air passing down through the ports 12 will pass inwardly to the outer face of the plunger 8 and downwardly around the plunger to the clearance chamber 26 and then downwardly through the port 27 inthe drill stem 28.

In the practical operation whenever it is desired to clean out the drill the handle 24 is pressed downwardly and the compressed air coming through the pipe 3 is directed through the port 5, the chamber 20,-the port 100 1.5, the groove 10, and the ports 12 to the chamber 26. I

Obviously steam may be used instead of compressed air.

I have shown my invention applied to a cochise rock hammer of the wet machine type but it is obvious that the invention may be applied to other "forms of machines.

Thus I have produced a rock drilling engine having a valve in communication with the main air line, a port leading from the valve to a groove around the plunger casing,

and ports leading from the groove and discharging at [the lower end of the plunger casing so that by operating the valve the full force of the air line may be directed to cleaning out the drilling mechanism and the cuttings of the rock.

Various changes may be made Without departing from the spir t of my nvention as claimed. 7

I claim:

1].. In a roclr cylinder having an;air inlet port, a plunger casing in the lower part of the air cylinder and having a groove in its top which communicatesHWith the air inlet portvot the cylinder, and there being a clearance chamber in the lower partor the cylinder vdrilling engine, an 311' and a series of ports formed through the plunger casing and connecting'said groove With the clearance chamber.

2. In a rock drilling engine, a. cylinder forming-a plungerchamber, a plunger casing forming a clearance chamber and fitting in the cylinder and having an annular the plunger casing, and a spring-pressed I valve normally closing said port. r

In testimony whereof I have signed my name to this specification.-

CHARLES A. HULTQUIST. 

